I believe T6 is a 5-40w synthetic. I've noticed a little tick on cold mornings at startup also, but it goes away within 30-40 seconds. Just leave the throttle alone when starting to keep from wacking a dry motor. No fluid leaks....Stepper motor replaced under warranty (replaced because Triumph wouldn't just pay to lubricate it properly.) Arrow map loaded for the LV pipe, mileage went from 50 to 38 mpg. I'll be loading the standard map before the weather warms up.